1st printing. Collects Uncanny X-Men (1963-2011 1st Series) #318-321, X-Men (1991-2008 1st Series) #38-41, X-Men Unlimited (1993-2003 1st Series) #4-7, X-Men (1991-2008 1st Series) Annual #3, X-Factor (1986-1998 1st Series) #107-109 and Cable (1993-2002 1st Series) #2.

Written by Scott Lobdell, Mark Waid, John Francis Moore, Howard Mackie, Ian Edginton, Todd DeZago, and Fabian Nicieza. Art by Roger Cruz, Andy Kubert, Richard Bennett, Liam Sharpe, Paul Smith, John Romita, Jr., Gene Ha, Paul Borges, Al Milgrom, Jan Duursema, Art Thibert, and Ron Garney. Cover byAndy Kubert.

The epic story that ushered in the Age of Apocalypse! Legion's once-shattered psyche is finally united, with a singular purpose: to make up for all the misery he has visited on his father, Charles Xavier. And to do it, he plans to make Xavier's dream a reality - by traveling back in time to kill its greatest obstacle, Magneto! The X-Men scramble to stop him from altering history - but, lost in the past, can they thwart Legion's misguided mission before the entire Marvel Universe is wiped away? Plus: Mystique seeks revenge against Legion, even as her shocking connection to Nightcrawler is revealed! And Storm returns to Cairo to face her past, but will she join the all-new Hellfire Club?

Hardcover, 592 pages, full color.